Cathode Properties of SmxSr1−x(Co,Fe,Ni)O3−/Sm0.2Ce0.8O1.9 Composite Material for Intermediate Temperature-Operating Solid Oxide Fuel Cell

摘要

Perovskite-structured cathode material containing samarium (Sm) has been recognizednas a promising electrode material due to its high electrocatalytic property for intermediatentemperature-operating solid oxide fuel cell (IT-SOFC). This research investigated thenoptimized composition of SmxSr1u0001x(Co,Fe,Ni)O3u0001u0002 /Sm0.2Ce0.8O1.9 on the Sm0.2Ce0.8O1.9nelectrolyte and the possible use of an optimized composite material for the IT-SOFCnsystem. The electrochemical and thermal properties of SmxSr1u0001x(Co,Fe,Ni)O3u0001u0002 and itsncomposite material with the Sm0.2Ce0.8O1.9 electrolyte were investigated in terms of areanspecific resistance (ASR) and thermal expansion coefficient at various temperature conditions.nDurability of the selected materials was verified by thermal cycling and longtermndegradation tests. Sm0.5Sr0.5CoO3u0001u0002 and the Sm0.5Sr0.5CoO3u0001u0002 /Sm0.2Ce0.8O1.9(6:4)ncomposite cathode showed a very low ASR of 0.87 u0003cm2 and 0.30 u0003cm2 at 600°C,nrespectively. The composite type cathode for the Sm0.5Sr0.5CoO3u0001u0002 material was morenattractive due to its thermal expansion compatibility with neighboring cell components.